* {
    margin: 0;
    padding: 0;
    list-style: none;
    box-sizing: border-box;
}

.warp {
    width: 100%;
    height: auto;
    background-color: cornflowerblue;

    .lan {
        width: 1000px;
        height: 30px;
        background-color:cornflowerblue;

        .tu {
            width: 200px;
            height: 30px;
            
            background-color: cornflowerblue;
            float: left;
        }
    }

}